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zlib 1.1.4

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Mark Adler
2011-09-09 23:20:42 -07:00
parent 14763ac7c6
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FAQ
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If your question is not there, please check the zlib home page
http://www.cdrom.com/pub/infozip/zlib/ which may have more recent information.
http://www.zlib.org which may have more recent information.
The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
1) I need a Windows DLL
2) I need a Visual Basic interface to zlib
3) compress() returns Z_BUF_ERROR
4) deflate or inflate returns Z_BUF_ERROR
5) Where is the zlib documentation (man pages, etc...)?
6) Why don't you use GNU autoconf, libtool, etc...?
7) There is a bug in zlib.
8) I get "undefined reference to gzputc"
1. Is zlib Y2K-compliant?
Yes. zlib doesn't handle dates.
2. Where can I get a Windows DLL version?
1) I need a Windows DLL
The zlib sources can be compiled without change to produce a DLL. If you
want a precompiled DLL, see http://www.winimage.com/zLibDll/ . Questions
about the zlib DLL should be sent to Gilles Vollant (info@winimage.com).
The zlib sources can be compiled without change to produce a DLL.
If you want a precompiled DLL, see http://www.winimage.com/zLibDll
3. Where can I get a Visual Basic interface to zlib?
See
* http://www.winimage.com/zLibDll/cmp-z-it.zip
* http://www.dogma.net/markn/articles/zlibtool/zlibtool.htm
* contrib/visual-basic.txt in the zlib distribution
2) I need a Visual Basic interface to zlib
4. compress() returns Z_BUF_ERROR
See http://www.tcfb.com/dowseware/cmp-z-it.zip
http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
and contrib/visual-basic.txt
Make sure that before the call of compress, the length of the compressed
buffer is equal to the total size of the compressed buffer and not
zero. For Visual Basic, check that this parameter is passed by reference
("as any"), not by value ("as long").
3) compress() returns Z_BUF_ERROR
5. deflate() or inflate() returns Z_BUF_ERROR
Make sure that before the call of compress, the length of the
compressed buffer is equal to the total size of the compressed buffer
and not zero. For Visual Basic, check that this parameter is passed
by reference ("as any"), not by value ("as long").
Before making the call, make sure that avail_in and avail_out are not
zero. When setting the parameter flush equal to Z_FINISH, also make sure
that avail_out is big enough to allow processing all pending input.
6. Where's the zlib documentation (man pages, etc.)?
4) deflate or inflate returns Z_BUF_ERROR
It's in zlib.h for the moment, and Francis S. Lin has converted it to a
web page zlib.html. Volunteers to transform this to Unix-style man pages,
please contact Jean-loup Gailly (jloup@gzip.org). Examples of zlib usage
are in the files example.c and minigzip.c.
Make sure that before the call avail_in and avail_out are not zero.
7. Why don't you use GNU autoconf or libtool or ...?
Because we would like to keep zlib as a very small and simple
package. zlib is rather portable and doesn't need much configuration.
5) Where is the zlib documentation (man pages, etc...)?
8. I found a bug in zlib.
It's in zlib.h for the moment. Volunteers to transform this
to man pages, please contact jloup@gzip.org. Examples of zlib usage
are in the files example.c and minigzip.c.
Most of the time, such problems are due to an incorrect usage of
zlib. Please try to reproduce the problem with a small program and send
the corresponding source to us at zlib@gzip.org . Do not send
multi-megabyte data files without prior agreement.
9. Why do I get "undefined reference to gzputc"?
6) Why don't you use GNU autoconf, libtool, etc...?
If "make test" produces something like
Because we would like to keep zlib as a very small and simple package.
zlib is rather portable and doesn't need much configuration.
example.o(.text+0x154): undefined reference to `gzputc'
check that you don't have old files libz.* in /usr/lib, /usr/local/lib or
/usr/X11R6/lib. Remove any old versions, then do "make install".
10. I need a Delphi interface to zlib.
7) There is a bug in zlib.
See the directories contrib/delphi and contrib/delphi2 in the zlib
distribution.
Most of the time, such problems are due to an incorrect usage
of zlib. Please try to reproduce the problem with a small
program and send us the corresponding source at zlib@quest.jpl.nasa.gov
Do not send multi-megabyte data files without prior agreement.
11. Can zlib handle .zip archives?
See the directory contrib/minizip in the zlib distribution.
8) I get "undefined reference to gzputc"
12. Can zlib handle .Z files?
If "make test" produces something like
example.o(.text+0x174):
check that you don't have old files libz.* in /usr/lib, /usr/local/lib
or /usr/X11R6/lib. Remove old versions then do "make install".
No, sorry. You have to spawn an uncompress or gunzip subprocess, or adapt
the code of uncompress on your own.
13. How can I make a Unix shared library?
make clean
./configure -s
make
14. Why does "make test" fail on Mac OS X?
Mac OS X already includes zlib as a shared library, and so -lz links the
shared library instead of the one that the "make" compiled. For zlib
1.1.3, the two are incompatible due to different compile-time
options. Simply change the -lz in the Makefile to libz.a, and it will use
the compiled library instead of the shared one and the "make test" will
succeed.
15. I have a question about OttoPDF
We are not the authors of OttoPDF. The real author is on the OttoPDF web
site Joel Hainley jhainley@myndkryme.com.